由 larry.tw » 2008-06-30 21:48
Leaching, the recovery of copper from the drainage water of mines, as a method of the extraction of minerals, it was well established as early as the eighteenth century, but until about 25 years ago miners did not realize that bacteria take an active part in the process.
C.was a well-established method of mineral extraction
我想請問一下,這邊的as early as是修飾啥?
跟誰比較阿?因為我看後面的18世紀好像找不到前面可以比較阿?